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Journal of Applied Physics : Characterization of a controlled plas...

By: A. Flacco, A. Guemnie-Tafo, R. Nuter, M. Veltcheva, D. Batani et al

Description: We present experimental and numerical results on the formation of a controlled plasma density gradient in front of a solid target irradiated with a subpicosecond, moderate intensity laser pulse. Interferometry with femtosecond probe is used to map the temporal evolution of the spatial density distribution of the generated plasma. Experimental results are found to be in good agreement with 1D1/2 hydrodynamic simulations. Moreover, these numerical simulations ...

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Applied Physics Letters : Power dissipation spectra and terahertz ...

By: Y. M. Zhu, T. Unuma, K. Shibata, K. Hirakawa, Y. Ino et al

Description: We have investigated terahertz radiation emitted from electrons photoexcited by femtosecond laser pulses in bulk GaAs under strong bias electric fields. Power dissipation spectra of electrons for step-function-like input electric fields have been obtained by calculating Fourier spectra of the measured terahertz traces. The cutoff frequency νc for negative power dissipation (i.e., gain) due to intervalley transfer is found to gradually increase with increasin...

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Physics of Fluids : Breakup of the tail of a bubble in a non-Newto...

By: Enrique Soto, Roberto Zenit, and Octavio Manero

Description:

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Applied Physics Letters : Coupling of nitrogen-vacancy centers in ...

By: K.-M. C. Fu, C. Santori, P. E. Barclay, I. Aharonovich, S. Prawer et al

Description: The optical coupling of guided modes in a GaP waveguide to nitrogen-vacancy (NV) centers in diamond is demonstrated. The electric field penetration into diamond and the loss of the guided mode are measured. The results indicate that the GaP-diamond system could be useful in realizing coupled microcavity-NV devices for quantum information processing in diamond.

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Journal of Mathematical Physics : The classical point electron in ...

By: Andre Gsponer

Description: The electric and magnetic fields of a pole-dipole singularity attributed to a point-electron singularity in the Maxwell field are expressed in a Colombeau algebra of generalized functions. This enables one to calculate dynamical quantities quadratic in the fields which are otherwise mathematically ill-defined: the self-energy (i.e., “mass”), the self-angular momentum (i.e., “spin”), the self-momentum (i.e., “hidden momentum”), and the self-force. While the t...

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Journal of Applied Physics : Spatio-temporal Talbot phenomenon usi...

By: J. S. Gómez-Díaz, A. Alvarez-Melcon, S. Gupta, and C. Caloz

Description: A spatial-temporal Talbot phenomenon, based on metamaterial composite right/left-handed (CRLH) leaky-wave antennas (LWAs), is presented. This phenomenon, reported in the microwave domain, is based on the combination of the conventional spatial monochromatic Talbot effect and the transient (polychromatic) character of the pulse radiation phenomenon in the LWA structure. When the elements of a periodic CRLH LWA array are fed simultaneously by an input pulse, t...

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Biblioteca Hispanica : Natural History Elements with Knowledge of ...

By: Fidel Faulin Ugarte
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Biblioteca Hispanica : Assay Course of Natural History Paintings

By: Emilio Ribera Gomez
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Review of Scientific Instruments : A collective scattering system ...

By: D. R. Smith, E. Mazzucato, W. Lee, H. K. Park, C. W. Domier et al

Description: A collective scattering system has been installed on the National Spherical Torus Experiment (NSTX) to measure electron gyroscale fluctuations in NSTX plasmas. The system measures fluctuations with k⊥ρe≲0.6 and k⊥≲20 cm−1. Up to five distinct wavenumbers are measured simultaneously, and the large toroidal curvature of NSTX plasmas provides enhanced spatial localization. Steerable optics can position the scattering volume throughout the plasma from the magnet...

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Biblioteca Hispanica : Lessons of Natural History

By: Augustine Yanez and Girona
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Journal of Applied Physics : Specific multiple-scattering process ...

By: Ying Cheng and XiaoJun Liu

Description: It was qualitatively demonstrated through finite-element full-wave simulations that acoustic cloak can be constructed by using concentric multilayered structure with alternating homogeneous isotropic materials [ Y. Cheng et al., Appl. Phys. Lett. 92, 151913 (2008) ]. Here we present a sequential in-depth analysis of the proposed cloak by means of the multiple-scattering algorithms. Calculated pressure fields demonstrate that the cloak possesses low-reflectio...

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Journal of Applied Physics : Formation and evolution of magnetic n...

By: J. Kliava, I. Edelman, O. Ivanova, R. Ivantsov, O. Bayukov et al

Description: Evolution of the phase state of paramagnetic additions at various stages of synthesis and subsequent thermal treatment of glasses of the system Al2O3–K2O–B2O3 simultaneously doped with Fe2O3 and MnO is studied by means of a combination of experimental techniques: Faraday rotation (FR), electron magnetic resonance (EMR), transmission electron microscopy (TEM), Mössbauer spectroscopy, and magnetic measurements. Both FR and EMR show that magnetically ordered cl...

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Journal of Applied Physics : Comparison of resonant-phonon-assiste...

By: H. Li, J. C. Cao, Z. Y. Tan, and S. L. Feng

Description: The authors compare resonant-phonon-assisted terahertz quantum-cascade lasers with different active region designs, i.e., one-well injector and three-well module, using an ensemble Monte Carlo method. Carrier transport under injection anticrossing, parasitic anticrossing, and collection anticrossing couplings are investigated for both structures. The results show that the main parasitic current channel is the resonance of the injector 1′ with the lower lasin...

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Journal of Applied Physics : Optical properties of silicon nanocry...

By: Leonid Khriachtchev, Timur Nikitin, Claudio J. Oton, Rama Velagapudi, Jani Sainio et al

Description: The optical properties of silica layers containing silicon nanocrystals are analyzed in terms of spectral filtering in absorbing planar waveguides (cutoff spectra), m-line measurements, and x-ray photoelectron spectroscopy (XPS). The effects of optical dispersion, approximation of weak guiding, and depth dependence of refractive index in a planar waveguide are studied. We compare the measured optical properties of silicon-rich silicon oxide samples with the ...

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Applied Physics Letters : Growth behaviors of ultrathin ZnSe nanow...

By: Y. Cai, T. L. Wong, S. K. Chan, I. K. Sou, D. S. Su et al

Description: Ultrathin ZnSe nanowires grown by Au-catalyzed molecular-beam epitaxy show an interesting growth behavior of diameter dependence of growth rates. The smaller the nanowire diameter, the faster is its growth rate. This growth behavior is totally different from that of the nanowires with diameters greater than 60 nm and cannot be interpreted by the classical theories of the vapor-liquid-solid mechanism. For the Au-catalyzed nanowire growth at low temperatures, ...

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Applied Physics Letters : Glasslike state in PbFe1/2Nb1/2O3 single...

By: Ashok Kumar, R. S. Katiyar, Carlos Rinaldi, Sergey G. Lushnikov, and Tatjana A. Shaplygina

Description: Magnetic properties of PbFe1/2Nb1/2O3 single crystal showed onset of glasslike behavior at 120 K, saturation of onset at 28 K, and freezing of glasslike state at 27.6 K. Zero field cooled (ZFC) and field cooled magnetization curves displayed sharp cusp in ZFC. Almeida and Toulouse line illustrated stability over 1000 Oe with unstable onset for low field. Magnetic hysteresis was observed below glasslike freezing temperature having steplike behavior and low co...

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Civil War and Civil War Related Prints : Col B Grierson, 6Th Ill C...

By: George John
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Applied Physics Letters : Enhanced four-wave mixing by atomic cohe...

By: Hai-Hua Wang, Dun-Mao Du, Yun-Fei Fan, Ai-Jun Li, Lei Wang et al

Description: We experimentally demonstrate an enhanced four-wave mixing FWM based on atomic coherence in a Pr3+:Y2SiO5 crystal. By employing coherent population return and fractional stimulated Raman adiabatic passage to prepare maximum atomic coherence in the crystal, an efficient FWM signal can be generated. By measuring the generated FWM signal, the time-dependent atomic coherence is monitored. Such an enhanced FWM in solids may have practical applications in nonlin...

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Applied Physics Letters : Low temperature diffusion length of exci...

By: Naoyuki Ino and Naoki Yamamoto

Description: Monochromatic cathodoluminescence (CL) images of threading dislocations in GaN epitaxial layers were observed using a transmission electron microscopy combined with CL system. The carrier diffusion lengths were derived from the free exciton emission intensity profile of the dislocation contrast in the CL images. The carrier diffusion lengths in Si-doped and Mg-doped GaN were nearly the same and shorter than that in undoped GaN in the temperature range from 2...

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Review of Scientific Instruments : A scanning Hall probe microscop...

By: V. V. Khotkevych, M. V. Miloševic, and S. J. Bending

Description: We present the design, construction, and performance of a low-temperature scanning Hall probe microscope with submicron lateral resolution and a large scanning range. The detachable microscope head is mounted on the cold flange of a commercial 3He-refrigerator (Oxford Instruments, Heliox VT-50) and operates between room temperature and 300 mK. It is fitted with a three-axis slip-stick nanopositioner that enables precise in situ adjustment of the probe locati...

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